I can run all five from the same folder (although in practice I run 4 from the same computer on the slave machine). Not only that but the slave machine is pretty crappy (2.0GHz E2180 CPU @ 2.8GHz, GF6600LE video, 2GB RAM, 250GB disk, crappy Shuttle motherboard) There is no evidence to suggest that having each account in a separate folder will offer increased performance.